Abstract: A swimming/scuba diving fin having a blade, a shoe open at the rear, an adjustable elastic strap engageable around the heel of the scuba diver, and two buckles at opposite ends of said adjustable elastic strap connected to two opposed side walls of said shoe, where at least one said buckle has a shaped hollow body forming integrally a portion connecting to said side wall, a channel for the axial sliding of the adjustable elastic strap, and a releasable fastening clamp of the adjustable elastic strap, where such an axial sliding channel has a hole for the inlet of the adjustable elastic strap, a hole for the outlet of the adjustable elastic strap and a deflection angle of the adjustable elastic strap positioned between such an inlet hole and such an outlet hole.

Abstract: A water flow deflection device configured to be attached to a side of a watercraft for wake enhancement, the water flow deflection device having a water flow deflector having a stationary portion operably connected to a foldable portion, the foldable portion capable of being configured between a fully extended position and a folded position with intermediate folding positions there between, whereby the foldable portion in the folded position is configured to facilitate storage of the device. The water flow deflection device also includes a frame connected to the stationary portion of the water flow deflector, the frame including a base, at least one extension arm, and two or more suction cups for attaching the water flow deflection device to the side of the boat.